Seal.



R P. JACKSON.

SEAL.

APPLICATION FILEDAPR. 3, 1914.

Patented Dec. 28, 1915.

lllrili o l" R m N L E V Wu ATTORN EY WITNESSES:

UNITED STATES PATENT OFFICE.

RAY I. JACKSON, OF EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

SEAL.

I Specification of Letters Patent.

Patented Dec. 28, 1915.

Application filed April 3, 1914. Serial No. 829,165.

To all whom it may concern:

Be it known that I, RAY P. JACKSON, a citizen of the United States, anda resident of Edgewood Park, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Seals, ofwhich the following is a specification.

My invention relates to seals between metallic conductors and the wallsof vitreous containers, and especially to seals for conductors that areadapted to carry heavy currents.

The purpose of my invention is to construct a seal of the type specifiedwhich shall be simple and inexpensive to manufacture, rugged inconstruction and adapted to hold a vacuum-tight joint throughout extremetemperature ranges.

In the accompanying drawing, Figure 1 shows a sectional elevation of thepreferred form of my improved seal, and Fig. 2 is a sectional elevationof a modification thereof.

1 designates the Wall of a container which is of vitreous material such,for example, as glass or quartz.

2 is a current conductor of copper, iron or similar material thatextends into the container and is here shown as the stem of an anode 3of a mercury vapor rectifier. Brazed to the stem 2 is a tubular metalmember 5 that is flared at its upper end and extended downwardly as abell shaped hood 6 to overhang the neck 7 of the container. The neck 7is outwardly flared at its upper end to engage the metal hood atapproximately the central zone thereof. Integral with the flaring neck,is a bell shaped member 8 of vitreous material that extends bothupwardly and downwardly and is intimately sealed to the inner surface ofmember 6 by a suitable flux. In order to insure that no leakage shalloccur between members 2 and 5, they may be united by an autogenous weldat the point 4.

The device of Fig. 2 is the same as that of Fig. 1 except that the metalbell shaped member is extended upwardly, as shown at the point 9,instead of being reentrant, and has its inner surface attached to stem 2above the upper end of the container 1.

Although the coeflicient of expansion of the metal member 6 is greaterthan that of the glass member 8, I so manufacture the seal that therewill be no strain on the joint from accidental shocks and blows.

between these two members when at the temperature 'of operation. Whenthe device cools, the member 6 will contract more than member 8 and thusplace the joint and the latter member under compression. Owing to thefact that the member 7 engages the member 8 at the central zone of thelatter, the compressive force will be balanced and there will be littleor no bending or twisting moment about the point of engagement. Thewalls of the bell shaped membersare nearly cylindrical below the centralzone thereof, thus insuring freedom from shearing stress on the sealbetween the two, which would be present were the members more nearlyconical in shape. The metal being outside the glass, protects the latterFurthermore, the metal on the outside of the container that is inelectrical connection with the anode stem will create a static field inthe manner set forth in United States Patent, No. 996,582 to Joseph L.R. Hayden and serve to prevent fading and the puncture of the containerwalls.

What I claim is:

1. The combination of a tubular member of vitreous material having anoutwardly flared end portion and an integral extension of bellsha.pe,with a metallic member extending into the tubular member, and ametallic bell shaped member sealed to the outer surface of the integralextension.

2. The combination of a tubular member of vitreous material having anoutwardly flared end portion and a bell shaped integral extensionsupported at its central zone by the outer edge of said flared portion,with a metallic member extending into the tubular'member, and a metallicbell shaped member sealed to the outer surface of the vitreous bellshaped member.

3. The combination of a tubular member of vitreous material having anoutwardly flared end portion and a bell shaped integral extensionsupported by the outer edge of said flared portion, with a metallicmember extending into the tubular member, and a metallic bell shapedmember sealed to the outer surface of said integral extension and havinga reentrant portion attached to said metallic member.

4. The combination of a tubular member of vitreous material having anoutwardly flared end portion and a bell shaped integral extensionsupported by the outer edge of said flared portion, with a metallicmember extending into the tubular member, a metallic bell shaped membersealed to the outer surface. of said integral extension, said bellshaped member having approximately cylindrical open ends.

5. The combination of a tubular member of vitreous material having anoutwardly flared end portion and a bell shaped integral extensionsupported at its central zone by the outer edge of said flared portion,With a metallic member extending into the tubular member, and a metallicbell shaped member sealed to the outer surface of the integral extensionand having a reentrant portion attached to said metallic .member,

RAY P. JACKSON. Witnesses:

GOLDIE E. MGGEE, B. B. Hmns.

